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Abstract. Excision of the apical bud (decapitation) of tobacco (Nicotiana tabacum L.) plants reduced the endogenous levels of indole-3-acetic acid (IAA), gibberellinA20 (GA20), and GA1 (the bioactive GA), in internode tissue below the excision site. Application of IAA to the stump of decapitated plants dramatically increased GA20 content, to a level 3-fold greater than in intact plants. GibberellinA1...
Research on the classical plant hormones continues to uncover fascinating interactions between these crucial regulatory compounds. Recent papers describe 'cross-talk' between the abscisic acid and ethylene signaling pathways in Arabidopsis, and how the nature of this interaction depends on organ type. Auxin has now been shown to promote the biosynthesis of active gibberellin in pea, by up-regulating...
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